New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere
A new composite δ18O record, generated from calcareous fine-fraction and bulk sediments from the Exmouth Plateau, details long-term Cretaceous climatic change at mid-latitudes in the Southern Hemisphere. Assessment of new and previously published δ18O data indicates that a mid-Cretaceous global clim...
| मुख्य लेखकों: | , |
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| स्वरूप: | Journal article |
| भाषा: | English |
| प्रकाशित: |
1999
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| _version_ | 1826300277110603776 |
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| author | Clarke, L Jenkyns, H |
| author_facet | Clarke, L Jenkyns, H |
| author_sort | Clarke, L |
| collection | OXFORD |
| description | A new composite δ18O record, generated from calcareous fine-fraction and bulk sediments from the Exmouth Plateau, details long-term Cretaceous climatic change at mid-latitudes in the Southern Hemisphere. Assessment of new and previously published δ18O data indicates that a mid-Cretaceous global climatic optimum was achieved sometime between the time of the Cenomanian-Turonian boundary and the middle Turonian, when surface-ocean paleotemperatures were the highest of the past 115 m.y. Periods of cooling and warming that reversed the general patterns were superimposed on long-term Aptian-Turonian warming and Turonian-Maastrichtian cooling trends, respectively. Extrapolation of Southern Hemisphere paleotemperature trends to Maastrichtian paleotemperature data from a low-latitude Pacific guyot implies that maximum mid-Cretaceous low-latitude paleotemperatures could have been in excess of 33 °C. |
| first_indexed | 2024-03-07T05:14:43Z |
| format | Journal article |
| id | oxford-uuid:dccab042-77b2-4d33-a3fe-441e7b64247a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:14:43Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:dccab042-77b2-4d33-a3fe-441e7b64247a2022-03-27T09:20:03ZNew oxygen isotope evidence for long-term Cretaceous climatic change in the Southern HemisphereJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:dccab042-77b2-4d33-a3fe-441e7b64247aEnglishSymplectic Elements at Oxford1999Clarke, LJenkyns, HA new composite δ18O record, generated from calcareous fine-fraction and bulk sediments from the Exmouth Plateau, details long-term Cretaceous climatic change at mid-latitudes in the Southern Hemisphere. Assessment of new and previously published δ18O data indicates that a mid-Cretaceous global climatic optimum was achieved sometime between the time of the Cenomanian-Turonian boundary and the middle Turonian, when surface-ocean paleotemperatures were the highest of the past 115 m.y. Periods of cooling and warming that reversed the general patterns were superimposed on long-term Aptian-Turonian warming and Turonian-Maastrichtian cooling trends, respectively. Extrapolation of Southern Hemisphere paleotemperature trends to Maastrichtian paleotemperature data from a low-latitude Pacific guyot implies that maximum mid-Cretaceous low-latitude paleotemperatures could have been in excess of 33 °C. |
| spellingShingle | Clarke, L Jenkyns, H New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title | New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title_full | New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title_fullStr | New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title_full_unstemmed | New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title_short | New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere |
| title_sort | new oxygen isotope evidence for long term cretaceous climatic change in the southern hemisphere |
| work_keys_str_mv | AT clarkel newoxygenisotopeevidenceforlongtermcretaceousclimaticchangeinthesouthernhemisphere AT jenkynsh newoxygenisotopeevidenceforlongtermcretaceousclimaticchangeinthesouthernhemisphere |